[Public-list] Atomic 4 compression

[George Dinwiddie]

Brian Palmer wrote:
> I'd like to switch to synthetic if nobody can tell me a reason it would be a
> mistake.

I've heard of people having transmission problems after using synthetic 
oil in an Atomic 4.  It could be that their transmissions were marginal 
anyway, but the transmission depends on friction and shares the oil sump 
with the engine.

Using a modern multigrade seems to be OK.

> Also, Bob, you mentioned that you use premium gas.  I was under the
> impression that older engines with lower compression, such as the A4,
> wouldn't benefit from it...

I agree.  Higher octane is to prevent premature ignition in 
high-compression engines, which the Atomic 4 isn't.  I've also heard 
that high-octane gas tends to leave *more* deposits than regular, but 
that's just hearsay.


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